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Aerospace series. Cap, protective, non-metallic, for EN 6123 fitting ends Ingestion-build-117251 Why should you use BSWhat is BS EN 6139 about? BS EN 6139 discusses standards for cap, protective, non metallic fitting ends. BS EN 6139 specifies the dimensions, tolerances, and required characteristics of protective caps, non metallic, for EN 6123 fitting ends to seal fluid ports during transportation and storage in order to prevent: Contamination by moisture, fluids, chemicals, and particles Spillage inside package or aircraft section Port and pipe end damages Port and